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# -*- coding: utf-8 -*-
# Minio Python Library for Amazon S3 Compatible Cloud Storage, (C) 2015 Minio, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
minio.error
~~~~~~~~~~~~~~~~~~~
This module provides custom exception classes for Minio library
and API specific errors.
:copyright: (c) 2015 by Minio, Inc.
:license: Apache 2.0, see LICENSE for more details.
"""
from xml.etree import cElementTree
from xml.etree.cElementTree import ParseError
if hasattr(cElementTree, 'ParseError'):
## ParseError seems to not have .message like other
## exceptions. Add dynamically new attribute carrying
## value from message.
if not hasattr(ParseError, 'message'):
setattr(ParseError, 'message', ParseError.msg)
_ETREE_EXCEPTIONS = (ParseError, AttributeError, ValueError, TypeError)
else:
_ETREE_EXCEPTIONS = (SyntaxError, AttributeError, ValueError, TypeError)
class MinioError(Exception):
"""
Base class for all exceptions
:param message: User defined message.
"""
def __init__(self, message, **kwargs):
super(MinioError, self).__init__(**kwargs)
self.message = message
def __str__(self):
return "{name}: message: {message}".format(
name=self.__class__.__name__,
message=self.message
)
class InvalidEndpointError(MinioError):
"""
InvalidEndpointError is raised when input endpoint URL is invalid.
"""
pass
class InvalidBucketError(MinioError):
"""
InvalidBucketError is raised when input bucket name is invalid.
NOTE: Bucket names are validated based on Amazon S3 requirements.
"""
pass
class InvalidArgumentError(MinioError):
"""
InvalidArgumentError is raised when an unexpected
argument is received by the callee.
"""
pass
class InvalidSizeError(MinioError):
"""
InvalidSizeError is raised when an unexpected size mismatch occurs.
"""
pass
class InvalidXMLError(MinioError):
"""
InvalidXMLError is raised when an unexpected XML tag or
a missing tag is found during parsing.
"""
pass
class MultiDeleteError(object):
"""
Represents an error raised when trying to delete an object in a
Multi-Object Delete API call :class:`MultiDeleteError <MultiDeleteError>`
:object_name: Object name that had a delete error.
:error_code: Error code.
:error_message: Error message.
"""
def __init__(self, object_name, err_code, err_message):
self.object_name = object_name
self.error_code = err_code
self.error_message = err_message
def __str__(self):
string_format = '<MultiDeleteError: object_name: {} error_code: {}' \
' error_message: {}>'
return string_format.format(self.object_name,
self.error_code,
self.error_message)
class ResponseError(MinioError):
"""
ResponseError is raised when an API call doesn't succeed.
raises :exc:`ResponseError` accordingly.
:param response: Response from http client :class:`urllib3.HTTPResponse`.
"""
def __init__(self, response, **kwargs):
super(ResponseError, self).__init__(message='', **kwargs)
self._response = response
# Initialize all the ResponseError fields.
self.method = ''
self.code = ''
self.bucket_name = ''
self.object_name = ''
# Amz headers
self.request_id = ''
self.host_id = ''
self.region = ''
# Ends.
# Additional copy of XML response for future use.
self._xml = response.data
def head(self, bucket_name, object_name=None):
"""
Generates :exc:`ResponseError` specific for head request.
:param bucket_name: Bucket name on which the error occurred.
:param object_name: Object name on which the error occurred, optional.
"""
self.method = 'HEAD'
self._set_error_response(bucket_name, object_name)
return self
def delete(self, bucket_name, object_name=None):
"""
Generates :exc:`ResponseError` specific for delete request.
:param bucket_name: Bucket name on which the error occurred.
:param object_name: Object name on which the error occurred, optional.
"""
self.method = 'DELETE'
self._set_error_response(bucket_name, object_name)
return self
def get(self, bucket_name=None, object_name=None):
"""
Generates :exc:`ResponseError` specific for get request.
:param bucket_name: Bucket name on which the error occurred, optional.
:param object_name: Object name on which the error occurred, optional.
"""
self.method = 'GET'
self._set_error_response(bucket_name, object_name)
return self
def put(self, bucket_name, object_name=None):
"""
Generates :exc:`ResponseError` specific for put request.
:param bucket_name: Bucket name on which the error occurred.
:param object_name: Object name on which the error occurred, optional.
"""
self.method = 'PUT'
self._set_error_response(bucket_name, object_name)
return self
def post(self, bucket_name, object_name=None):
"""
Generates :exc:`ResponseError` specific for post request.
:param bucket_name: Bucket name on which the error occurred.
:param object_name: Object name on which the error occurred, optional.
"""
self.method = 'POST'
self._set_error_response(bucket_name, object_name)
return self
def _set_error_response(self, bucket_name=None, object_name=None):
"""
Sets error response uses xml body if available, otherwise
relies on HTTP headers.
"""
if not self._response.data:
self._set_error_response_without_body(bucket_name, object_name)
else:
self._set_error_response_with_body(bucket_name, object_name)
def _set_error_response_with_body(self, bucket_name=None,
object_name=None):
"""
Sets all the error response fields with a valid response body.
Raises :exc:`ValueError` if invoked on a zero length body.
:param bucket_name: Optional bucket name resource at which error
occurred.
:param object_name: Option object name resource at which error
occurred.
"""
self.bucket_name = bucket_name
self.object_name = object_name
if len(self._response.data) == 0:
raise ValueError('response data has no body.')
try:
root = cElementTree.fromstring(self._response.data)
except _ETREE_EXCEPTIONS as error:
raise InvalidXMLError('"Error" XML is not parsable. '
'Message: {0}'.format(error.message))
for attribute in root:
if attribute.tag == 'Code':
self.code = attribute.text
elif attribute.tag == 'BucketName':
self.bucket_name = attribute.text
elif attribute.tag == 'Key':
self.object_name = attribute.text
elif attribute.tag == 'Message':
self.message = attribute.text
elif attribute.tag == 'RequestId':
self.request_id = attribute.text
elif attribute.tag == 'HostId':
self.host_id = attribute.text
# Set amz headers.
self._set_amz_headers()
def _set_error_response_without_body(self, bucket_name=None,
object_name=None):
"""
Sets all the error response fields from response headers.
:param bucket_name: Optional bucket name resource at which error
occurred.
:param object_name: Option object name resource at which error
occurred.
"""
self.bucket_name = bucket_name
self.object_name = object_name
if self._response.status == 404:
if bucket_name:
if object_name:
self.code = 'NoSuchKey'
self.message = self._response.reason
else:
self.code = 'NoSuchBucket'
self.message = self._response.reason
elif self._response.status == 409:
self.code = 'Confict'
self.message = 'The bucket you tried to delete is not empty.'
elif self._response.status == 403:
self.code = 'AccessDenied'
self.message = self._response.reason
elif self._response.status == 400:
self.code = 'BadRequest'
self.message = self._response.reason
elif self._response.status == 301:
self.code = 'PermanentRedirect'
self.message = self._response.reason
elif self._response.status == 307:
self.code = 'Redirect'
self.message = self._response.reason
elif self._response.status in [405, 501]:
self.code = 'MethodNotAllowed'
self.message = self._response.reason
elif self._response.status == 500:
self.code = 'InternalError'
self.message = 'Internal Server Error.'
else:
self.code = 'UnknownException'
self.message = self._response.reason
# Set amz headers.
self._set_amz_headers()
def _set_amz_headers(self):
"""
Sets x-amz-* error response fields from response headers.
"""
if self._response.headers:
# keeping x-amz-id-2 as part of amz_host_id.
if 'x-amz-id-2' in self._response.headers:
self.host_id = self._response.headers['x-amz-id-2']
if 'x-amz-request-id' in self._response.headers:
self.request_id = self._response.headers['x-amz-request-id']
# This is a new undocumented field, set only if available.
if 'x-amz-bucket-region' in self._response.headers:
self.region = self._response.headers['x-amz-bucket-region']
def __str__(self):
return ('ResponseError: code: {0}, message: {1},'
' bucket_name: {2}, object_name: {3}, request_id: {4},'
' host_id: {5}, region: {6}'.format(self.code,
self.message,
self.bucket_name,
self.object_name,
self.request_id,
self.host_id,
self.region))